Main Entry: di·as·to·le

Pronunciation: \dī-ˈas-tə-(ˌ)lē\

Function: noun

1 : the passive rhythmical expansion or dilation of the cavities of the heart during which they fill with blood—compare systole
2 : the rhythmical expansion of a pulsating vacuole (as of an ameba)

—di·a·stol·ic \ˌdī-ə-ˈstäl-ik\ adjective